Annual report pursuant to Section 13 and 15(d)

Earnings (Loss) Per Share (Details Textual)

v2.4.0.8
Earnings (Loss) Per Share (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Conversion principal amount $ 905,055 $ 722,797
1.875% convertible senior notes due 2032 [Member]
   
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 1.875% 1.88%
Debt instrument, convertible, conversion ratio 17.1985  
Conversion principal amount $ 126,500 $ 126,500